Wiseman, P and Smith, M and Desai, Shantanu and et al, .
(2020)
Supernova Host Galaxies in the Dark Energy Survey: I. Deep Coadds, Photometry, and Stellar Masses.
arXiv.org.
Abstract
The five-year Dark Energy Survey supernova programme (DES-SN) is one of the
largest and deepest transient surveys to date in terms of volume and number of supernovae. Identifying and characterising the host galaxies of transients plays a key
role in their classification, the study of their formation mechanisms, and the cosmological analyses. To derive accurate host galaxy properties, we create depth-optimised
coadds using single-epoch DES-SN images that are selected based on sky and atmospheric conditions. For each of the five DES-SN seasons, a separate coadd is made
from the other 4 seasons such that each SN has a corresponding deep coadd with
no contaminating SN emission. The coadds reach limiting magnitudes of order ∼ 27
in g-band, and have a much smaller magnitude uncertainty than the previous DESSN host templates, particularly for faint objects. We present the resulting multi-band
photometry of host galaxies for samples of spectroscopically confirmed type Ia (SNe
Ia), core-collapse (CCSNe), and superluminous (SLSNe) as well as rapidly evolving
transients (RETs) discovered by DES-SN. We derive host galaxy stellar masses and
probabilistically compare stellar-mass distributions to samples from other surveys. We
find that the DES spectroscopically confirmed sample of SNe Ia selects preferentially
fewer high mass hosts at high redshift compared to other surveys, while at low redshift
the distributions are consistent. DES CCSNe and SLSNe hosts are similar to other
samples, while RET hosts are unlike the hosts of any other transients, although these
differences have not been disentangled from selection effects.
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